<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="css/bootstrap.min.css">
    <script src="js/bootstrap.min.js"></script>
</head>
<body>
    <nav class="container-fluid navbar navbar-expand-md bg-white navbar-light ">
     
            
                <a class=" navbar-brand" href="#">Navbar</a>
            
            <button class="navbar-toggler ms-auto" type="button" data-bs-toggle="collapse" data-bs-target="#collapsibleNavbar">
              <span class="navbar-toggler-icon"></span>
            </button>
           
                <div class="collapse  w-100 navbar-collapse" id="collapsibleNavbar">
                    <ul class="navbar-nav m-auto">
                        <li class="nav-item dropdown">
                            <a class="nav-link dropdown-toggle" href="#" id="navbardrop" data-bs-toggle="dropdown">
                              Dropdown 1
                            </a>
                            <div class="dropdown-menu ">
                              <a class="dropdown-item" href="#">Link 1</a>
                              <a class="dropdown-item" href="#">Link 2</a>
                              <a class="dropdown-item" href="#">Link 3</a>
                            </div>
                          </li>
                          <li class="nav-item dropdown">
                            <a class="nav-link dropdown-toggle" href="#" id="navbardrop" data-bs-toggle="dropdown">
                              Dropdown 2
                            </a>
                            <div class="dropdown-menu">
                              <a class="dropdown-item" href="#">Link 1</a>
                              <a class="dropdown-item" href="#">Link 2</a>
                              <a class="dropdown-item" href="#">Link 3</a>
                            </div>
                          </li>
                          <li class="nav-item dropdown">
                            <a class="nav-link dropdown-toggle" href="#" id="navbardrop" data-bs-toggle="dropdown">
                              Dropdown 3
                            </a>
                            <div class="dropdown-menu">
                              <a class="dropdown-item" href="#">Link 1</a>
                              <a class="dropdown-item" href="#">Link 2</a>
                              <a class="dropdown-item" href="#">Link 3</a>
                            </div>
                          </li>
                          <li class="nav-item dropdown">
                            <a class="nav-link dropdown-toggle" href="#" id="navbardrop" data-bs-toggle="dropdown">
                              Dropdown 4
                            </a>
                            <div class="dropdown-menu">
                              <a class="dropdown-item" href="#">Link 1</a>
                              <a class="dropdown-item" href="#">Link 2</a>
                              <a class="dropdown-item" href="#">Link 3</a>
                            </div>
                          </li>
                      </ul>
                </div> 
           
           
                <a class="navbar-brand " href="#">Navbar</a>
         
        
    </nav> 
    <div class="container mt-2">
        <div class="row">
            <div class="col-md-6">
                <div class="bg-secondary">&nbsp;</div>
                <div class="bg-light">&nbsp;</div>
                <div class="bg-secondary">&nbsp;</div>
                <div class="bg-light">&nbsp;</div>
                <div class="bg-secondary">&nbsp;</div>
                <div class="bg-light">&nbsp;</div>
                <div class="bg-secondary">&nbsp;</div>
                <div class="bg-light">&nbsp;</div>
                <div class="bg-secondary">&nbsp;</div>
                <div class="bg-light">&nbsp;</div>
                <div class="bg-secondary">&nbsp;</div>
                <div class="bg-light">&nbsp;</div>
                <div class="bg-secondary">&nbsp;</div>
                <div class="bg-light">&nbsp;</div>

            </div>
            <div class="col-md-6">
                <div class="bg-light">&nbsp;</div>
                <div class="bg-secondary">&nbsp;</div>
                <div class="bg-light">&nbsp;</div>
                <div class="bg-secondary">&nbsp;</div>
                <div class="bg-light">&nbsp;</div>
                <div class="bg-secondary">&nbsp;</div>
                <div class="bg-light">&nbsp;</div>
                <div class="bg-secondary">&nbsp;</div>
                <div class="bg-light">&nbsp;</div>
                <div class="bg-secondary">&nbsp;</div>
                <div class="bg-light">&nbsp;</div>
                <div class="bg-secondary">&nbsp;</div>
                <div class="bg-light">&nbsp;</div>
                <div class="bg-secondary">&nbsp;</div>
            </div>
        </div>
    </div>   
    <div class="container mt-5">
        <div class="row">
            <div class="col-md-3">
                <div class="bg-secondary" style="width: 80%; height: 150px; margin: 0 auto;"></div>
            </div>
            <div class="col-md-3 ">
                <div class="bg-light" style="width: 80%; height: 150px; margin: 0 auto;"></div>
            </div>
            <div class="col-md-3 ">
                <div class="bg-secondary" style="width: 80%; height: 150px; margin: 0 auto;"></div>
            </div>
            <div class="col-md-3 ">
                <div class="bg-light" style="width: 80%; height: 150px; margin: 0 auto;"></div>
            </div>
        </div>
    </div>
</body>
</html>